"Rectangular" one on the right.

IMO no context gets no answers . A reason why that table there at all.What will the mirror reflect ? IMO mirrors are best hung where thye reflect something worth seeing twice .Post pics of the space here in comments DO NOT start another post.

Rectangular one

Rectanglar!

Rectangular

Can you post more photos? Is that mirror near a front door?

Rectangular one looks best.

Patricia, IMO I really don’t have to have your answer.

Need more context -- right now, the only thing I can see is the picture frame in the foreground, which seems like it would make the round one match better. But surely there's more in this space than that!

It appears from this one lone photo that both mirrors are too small for the chest and room.

I like the round one. The arched mirror shape and style is very nice; but with your console/cabinet, I think that mirror is going to give more of a bedroom dresser look. I don’t think this is a bedroom. It‘s likely your house entry or room/area entry. The round works better. It also offers more contrast as it has a darker frame. Nice choice.

This may be a better angle.

Hmmmm. That last pic shows an odd space and furniture. I don’t think that chest and mirror are right for that spot. If you want to post more pix of the room, maybe that would help understand the room better.

There’s nothing ”odd” about it. It’s her entry hall.

it looks like both options are too small for this cabinet.

It is an empty space that leads to other rooms. I was using it as part of my foyer.

I suggest you try one at a time using Command™ hooks, or leaning them on the top of the table (perhaps use an easel for the round one, maybe placed on a sturdy box, for correct height), and live with each for at least a week. That will help you decide which looks better to you—which is what really counts.

I will try that. We recently repainted so I’m trying not to make too many mistakes hanging things up.